Change static to dynamic method getUri.

app/router/Router.php

@@ -64,27 +64,26 @@ class Router
         return $this->route;
     }
 
-    public function routeIsExists($name)
+    protected function routeIsExists($name)
     {
         return array_key_exists($name, $this->routes);
     }
 
-    public function getRouteByName($name)
+    protected function getRouteByName($name)
     {
         return $this->routes[$name];
     }
 
-    static public function getUri($route_name = null)
+    public function getUri($route_name = null)
     {
-        $router = FrontController::getInstance()->getRouter();
         if (is_null($route_name)) {
-            $route = $router->getRoute();
+            $route = $this->getRoute();
         } else {
-            if ($router->routeIsExists($route_name)) {
-                $route = $router->getRouteByName($route_name);
+            if ($this->routeIsExists($route_name)) {
+                $route = $this->getRouteByName($route_name);
             } else {
                 $btrace = debug_backtrace();
-                throw new ErrorException('Unknown route handler: "' . $route_name . '". ' . 'Call from "' . $btrace[0]['file'] . '" on line ' . $btrace[0]['line'] . '.');
+                throw new ErrorException('Unknown route name: "' . $route_name . '". ' . 'Call from "' . $btrace[0]['file'] . '" on line ' . $btrace[0]['line'] . '.');
             }
         }
         return $route->getUri();